In our high-tech world, keeping your home fully protected is easier than it's ever been. Vastly more sophisticated than those blaring door alarms of yesteryear, today's home security gadgets are discreet, packed with dozens of different security features, require little to no installation, and can be controlled right from an app on your smart phone. Best of all, they're affordable and need neither subscriptions nor contracts. Check out a few of the more popular security gadgets to hit the market recently, and consider welcoming one of them into your abode.